November 14, 2018 — Most readers here probably know that I am very honored to have
been invited to join the CO2 Coalition, an organization of mostly-prominent
scientists (plus a few no-names like me!), dedicated to de-politicizing the public debate surrounding CO2
emissions and climate change, and helping to substitute sound scientific analysis for unscientific climate
hysteria.
Today I'm pleased to share a letter by Prof. William H. Smith
(pdf or
ePub),
entitled, The Double Bind and Scientific Honesty, in which (among other things) he explains why
he, too, is very pleased to be a member of the CO2 Coalition.
In his letter Prof. Smith also mentions this 30 year old (1988)
editorial, by the late
Dr. Stephen Schneider, in which Dr. Schneider wrestled with “groping to find the balance between
being effective and being honest.” Not mentioned in his editorial was the fact that, at that time,
Dr. Schneider was a relatively fresh convert to global warming alarmism. A decade earlier, he made an
appearance in this 1978 television program (starting at about
the 6:00 minute mark), worrying about (can you guess?), global
cooling. ↑

September 10, 2018 —
Apologies in advance if sealevel.info goes down during the hurricane, which is likely.
In the meantime, if you want to learn more about climate change, here are some good resources:https://sealevel.info/learnmore.html
UPDATE: Thankfully, we had no problems, and no damage. The power didn't even go off. ↑

August 15, 2018 —
Our CO2 data and graphs have been updated to include an estimate for 2018, 408.4 ppmv
(based on seasonally-adjusted June & July measurements). ↑

April 14, 2018 — It's now been six years since
the “Fakegate” scandal,
in which the Climate Movement's top ethicist, Dr. Peter Gleick, and the climate activists at DeSmogBlog,
conspired to smear Heartland Institute with a clumsily forged fake “strategy
memo.”
They got caught, which you'd think would end their careers, and land at least some of them in prison.
But it really hasn't hurt them much. The Obama-appointed U.S. Attorney protected them by refusing to prosecute
until the statute of limitations had run out, and most climate activists don't seem to mind being lied to.

March 27, 2017 — A Tutorial On Climate Change. Oakland and San Francisco, California,
have have filed lawsuits against oil companies to recover costs associated with adapting to climate change.
U.S. District Judge William Alsup, who is presiding over the case, requested that the parties provide tutorials
on climate change and the history of climate science.
This is one such tutorial, submitted to the Court as an amicus brief by three extremely distinguished
scholars: Drs. William Happer, Steven Koonin, and Richard Lindzen:
Happer-Koonin-Lindzen.pdf
(or here)

February 14, 2018 — A few decades ago, the focus of most “climate scientists” (who were
generally called climatologists, back then), shifted from observations to modeling.
These days, all the climate catastrophists' predictions are based on alarming computer models, which, desite 2/3
century of rapidly climbing greenhouse gas emissions and levels, are still largely unconfirmed by measurements.
Enough time has elapsed to compare those early computer projections with measured reality. So how have they fared?
Here I examine the very alarming predictions of a groundbreaking and highly influential 1988 climate modeling paper:http://sealevel.info/hansen1988_retrospective.html
3½ months after that paper was published, the IPCC was founded, to address that perceived problem—which
turns out to have been much ado about very little.

October 27, 2017 — How did news organizations like WRAL come to believe that it's valid journalism to
seek out "experts" at only one extreme of the range of the scientific opinion, for their "documentaries?" That's
not news reporting, that's propagandizing.
Here's NC's longest, highest-quality sea-level record (Wilmington), plus the WRAL prediction.
Sea-level there has been rising at about 2.3 mm/year for the last 82 years.
WRAL predicts 11.1 mm/year over the next 83 years = ~5x as fast as the real trend. That's despite the fact that,
other than spikes with strong El Ninos, there's been no significant acceleration in sea-level rise, so far.
Read more here:http://sealevel.info/cmt_on_wral_2017-10_sealevel_documentary.html

July 29, 2017 — Our Internet service went down yesterday, and it's still down. As of this morning, the
server is back up (sort of), limping along on a lower-bandwidth, jury-rigged temporary connection. Please forgive
the outage and the sluggish response times.
Update: as of July 31, 2017 we're back up on the regular connection.

March 27, 2017 — I've added an option to plot an extra line segment or curve, typically
used to display a forecast of future sea-level rise. The projection can be drawn with either a
constant acceleration curve, or a constant slope (linear). For example, here are the
linear
and
constant acceleration
graphs showing the wildly unrealistic accelerations required to
reach the “three feet by 2060” prediction of some of the crazier climate alarmists for Miami.

February 9, 2017 — The Next / Previous buttons on the sea-level analysis pages now do a better
job of taking you to a related page (e.g., another site in the same country/coast).

January 26, 2017 — Try the new (preliminary) country/coastline code list on the Data page.

January 9, 2017 — All 1269 tide stations now have "thumbnail" graphs. (Technical note:
the graphs are generated using Google Visualization tools,
in Javascript — which can't write files. Ask me how I extracted the graphs, to make the thumbnail files!)

Options are provided to choose the data source (NOAA vs. PSMSL, though not yet for all locations), to choose whether to display the
linear trend (calculated from all available data, rather than recalculated every few years, as
NOAA does) and/or quadratic trend (for detecting acceleration/deceleration), and to choose
whether to display confidence intervals, prediction intervals, and CO2 level. Additionally, you
can optionally constrain the range of dates shown or analyzed, smooth the data in various ways,
and adjust various display options, such as colors and line thickness.

February 3, 2016 — New "Feedbacks" page added. Everything You
Always Wanted to Know About Climate Feedbacks* (*But Were Afraid to
Ask).
It's still a bit rough around the edges. As always, I would be grateful for your
feedback comments & corrections.

December 18, 2015 — The Heartland Institute is
one of the world's finest public policy think tanks, and they've compiled
an impressive collection of information about the COP-21
Paris climate conference, here:
https://www.heartland.org/Cop21/P.S. (12/28/2015) — someone complained about this link, who had apparently been misled by the Peter Gleick /
DeSmogBlog forged document smear of Heartland.
If you're not familiar with the story, read on. Dr. Gleick tried to anonymously
distribute a “strategy memo” purportedly leaked from Heartland, which was
actually a forgery, almost certainly created by Gleick, himself.
Here's an article
about the affair, from The Atlantic. Gleick was subsequently rewarded for his
crimes by National Geographic's ScienceBlog subsidiary, where he's now their
resident “scientist, innovator, and communicator” on global water, environment,
climate, and presumably identity theft, fraud, character assassination, and forgery. ↑

December 14, 2015 — Good essay today in USA Today
by Rep. Lamar Smith (R-TX), chairman of the U.S. House Science, Space and Technology Committee.

December 8, 2015 — The Resources page of this site got a long-overdue
reorganization. Suggestions for further improvement are very welcome.

April 2, 2013 — NOAA has released a major update of
their tidestation data,
with updated trend analysis and graphs for many stations, and many newly-analyzed
PSMSL stations! See the new 2013 spreadsheets on the sealevel.info data page.
(Note: as a result of these changes there are a few dead links in some of the older
spreadsheets, which I've not yet fixed.)

March 23, 2013 — Rev 0.7, added a spreadsheet with just the 45 NOAA-administered GLOSS-LTT tide stations,
and also one with just the 42 of those 45 for which there was data through 2011. (The other
stations were three Pacific Islands: Johnston Atoll, Pago Pago, and Chuuk.)

Notes: In 2012 NOAA recalculated sea-level trends for those
42 U.S. tide gauges using data through 2011. The results were illuminating.

The sea-level records for the 42 gauges had an average duration of 87.4 years (through 2011),
and NOAA's calculated trends had an average confidence interval of ±0.515 mm/yr.

When new (through 2011) trends were compared to the old (through 2006) trends, 23 sites showed
slight declines in the rate of sea-level rise, and 19 showed slight increases.

A simple, unweighted average of the 42 gauges comes to 2.025 mm/yr average rate of SLR through 2006,
or 2.026 mm/yr through 2011 (a difference of one one-thousandth of a millimeter/year), or 1.286 mm/yr
if you include Peltier's VM2 GIA adjustments.

The bottom line is that, as measured by the 42 best U.S. long-term trend tide stations,
the average rate of sea-level rise over the 5-year period from 2006-2011 is virtually identical
to the rate for the full data record (averaging 87.4 years duration) -- more proof that there's
been no detectable acceleration in rate of sea-level rise in response to elevated CO2 levels.

March 8, 2013 — updated spreadsheets with latest NOAA and PSMSL data.

March 1, 2013 — Rev 0.6, most of the spreadsheets here
now have clickable column headers. Click a column header to sort the data by that
column. Click again to reverse the sort order.

September 29, 2012 — Rev. 0.5, added more papers to the Papers page, and more
resources to the Resources page